Cabinet Office transition plans reveal N3 extension and potential tie-up between N4 and PSN The NHS's N3 network could be set to run for another year, according to documents released by the Cabinet Office, with plans to establish a successor already under way. N3, one of the largest VPNs in Europe with more than 40,000 connections, is managed by BT. The seven-year contract with the telco, signed in 2004, was extended in 2010 , enabling it to run until March 2013. The deal now looks likely to be extended for a further year, with the NHS set to build a case for the contract extension and seek...